10.3.4.5
Three/single-phase selection variation examples
The provided rules always apply for single-phase (
Phase Mode
is "Single Phase") power
systems. However, for three-phase power systems (where
Phase Mode
is "Three Phase"),
it is required that all the phases have to be activated before the activation of the
PICKUP
output. Interruption event indication requires all three phases to undershoot
Voltage Int set
simultaneously, as shown in
. When the requirement for interruption for "Three
Phase" is no longer fulfilled, variation is indicated as a dip as long as all phases are active.
In case of a single-phase interruption of
, when there is a dip indicated in
another phase but the third phase is not active, there is no variation indication pickup when
Phase Mode
is "Three Phase". In this case, only the
Phase Mode
value "Single Phase"
results in the
PICKUP_B
interruption and the
PICKUP_A
dip.
It is also possible that there are simultaneously a dip in one phase and a swell in other
phases. The functionality of the corresponding event indication with one inactive phase is
shown in
. Here, the "Swell + dip" variation type of
Phase mode
is "Single
Phase". For the selection "Three Phase" of
Phase mode
, no event indication or any
activation takes place due to a non-active phase.
V_A
V_C
V_B
ST_B
ST_C
ST_A
DIPST
INTST
SWELLST
SWELLOPR
INTOPR
DIPOPR
Voltage Int set
Voltage dip set
Voltage swell set
FALSE
TRUE
FALSE
TRUE
FALSE
TRUE
FALSE
TRUE
FALSE
TRUE
FALSE
TRUE
FALSE
TRUE
FALSE
TRUE
FALSE
TRUE
GUID-0657A163-7D42-4543-8EC8-3DF84E2F0BF5-ANSI V2 EN
Figure 536:
Concurrent dip and swell when Phase mode is "Single Phase"
1MAC059074-MB A
Section 10
Power quality measurement functions
615 series ANSI
1049
Technical Manual
Summary of Contents for Relion 615 series
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